Buggy code:
labelClass . setText ( "Choose<seq2seq4repair_space>class:" ) ; labelFileName . setText ( "File<seq2seq4repair_space>name:" ) ; textFileName . setEditable ( false ) ; textFileName . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { textFileNameActionPerformed ( evt ) ; } } ) ; buttonFileName . setText ( "..." ) ; buttonFileName . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { buttonFileNameActionPerformed ( evt ) ; } } ) ; comboAlgorithm . setModel ( new DefaultComboBoxModel < > ( new String [ ] { MainFrame . ALGO_KNN , MainFrame . ALGO_NAIVE_BAYES } ) ) ; comboAlgorithm . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { comboAlgorithmActionPerformed ( evt ) ; } } ) ; labelAlgorithm . setText ( "Algorithm:" ) ; spinnerAlgorithm . setModel ( new SpinnerNumberModel ( 1 , 1 , 1 , 1 ) ) ; labelTraining . setText ( "Training<seq2seq4repair_space>Schema:" ) ; comboTraining . setModel ( new DefaultComboBoxModel < > ( new String [ ] { MainFrame . TRAINING_N_FOLD , MainFrame . TRAINING_FULL } ) ) ; comboTraining . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { comboTrainingActionPerformed ( evt ) ; } } ) ; <START_BUG> spinnerTraining . setModel ( new SpinnerNumberModel ( 10 , 1 , 100 , 1 ) ) ; <END_BUG> saveToFile . setText ( "Save<seq2seq4repair_space>Model<seq2seq4repair_space>to<seq2seq4repair_space>File" ) ; saveToFile . setEnabled ( false ) ; saveToFile . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { saveToFileActionPerformed ( evt ) ; } } ) ; GroupLayout jPanel1Layout = new GroupLayout ( jPanel1 ) ; jPanel1 . setLayout ( jPanel1Layout ) ; jPanel1Layout . setHorizontalGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( jPanel1Layout . createSequentialGroup ( ) . addGap ( 21 , 21 , 21 ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . TRAILING ) . addComponent ( paneResult ) . addComponent ( comboClass , GroupLayout . Alignment . LEADING , 0 , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) . addGroup ( jPanel1Layout . createSequentialGroup ( ) . addComponent ( textFileName ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( buttonFileName , GroupLayout . PREFERRED_SIZE , 30 , GroupLayout . PREFERRED_SIZE ) ) . addGroup ( GroupLayout . Alignment . LEADING , jPanel1Layout . createSequentialGroup ( ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addComponent ( labelFileName ) . addComponent ( labelTraining ) . addComponent ( labelClass ) . addComponent ( labelAlgorithm ) ) . addGap ( 0 , 0 , Short . MAX_VALUE ) ) . addGroup ( jPanel1Layout . createSequentialGroup ( ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . TRAILING ) . addComponent ( comboTraining , 0 , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) . addComponent ( comboAlgorithm , 0 , GroupLayout . DEFAULT_SIZE , Short . MAX_VALUE ) ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . LEADING , false ) . addComponent ( spinnerAlgorithm ) . addComponent ( spinnerTraining , GroupLayout . PREFERRED_SIZE , GroupLayout . DEFAULT_SIZE , GroupLayout . PREFERRED_SIZE ) ) ) . addGroup ( jPanel1Layout . createSequentialGroup ( ) . addGap ( 0 , 0 , Short . MAX_VALUE ) . addComponent ( buttonRun , GroupLayout . PREFERRED_SIZE , 132 , GroupLayout . PREFERRED_SIZE ) . addGap ( 258 , 258 , 258 ) . addComponent ( saveToFile , GroupLayout . PREFERRED_SIZE , 126 , GroupLayout . PREFERRED_SIZE ) ) ) . addGap ( 20 , 20 , 20 ) ) ) ; jPanel1Layout . setVerticalGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . LEADING ) . addGroup ( jPanel1Layout . createSequentialGroup ( ) . addContainerGap ( ) . addComponent ( labelFileName ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . BASELINE ) . addComponent ( textFileName , GroupLayout . PREFERRED_SIZE , GroupLayout . DEFAULT_SIZE , GroupLayout . PREFERRED_SIZE ) . addComponent ( buttonFileName ) ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( labelAlgorithm ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . BASELINE ) . addComponent ( comboAlgorithm , GroupLayout . PREFERRED_SIZE , GroupLayout . DEFAULT_SIZE , GroupLayout . PREFERRED_SIZE ) . addComponent ( spinnerAlgorithm , GroupLayout . PREFERRED_SIZE , 31 , GroupLayout . PREFERRED_SIZE ) ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( labelTraining ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . BASELINE ) . addComponent ( comboTraining , GroupLayout . PREFERRED_SIZE , GroupLayout . DEFAULT_SIZE , GroupLayout . PREFERRED_SIZE ) . addComponent ( spinnerTraining , GroupLayout . PREFERRED_SIZE , 31 , GroupLayout . PREFERRED_SIZE ) ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( labelClass ) . addPreferredGap ( LayoutStyle . ComponentPlacement . RELATED ) . addComponent ( comboClass , GroupLayout . PREFERRED_SIZE , GroupLayout . DEFAULT_SIZE , GroupLayout . PREFERRED_SIZE ) . addGap ( 18 , 18 , 18 ) . addGroup ( jPanel1Layout . createParallelGroup ( GroupLayout . Alignment . BASELINE ) . addComponent ( buttonRun ) . addComponent ( saveToFile ) ) . addGap ( 11 , 11 , 11 ) . addComponent ( paneResult , GroupLayout . PREFERRED_SIZE , 190 , GroupLayout . PREFERRED_SIZE ) . addContainerGap ( 17 , Short . MAX_VALUE ) ) ) ; jTabbedPane1 . addTab ( "Classifier" , jPanel1 ) ; buttonRun1 . setText ( "Run" ) ; buttonRun1 . setEnabled ( false ) ; buttonRun1 . addActionListener ( new ActionListener ( ) { public void actionPerformed ( ActionEvent evt ) { buttonRun1ActionPerformed ( evt ) ;

Fix:
spinnerTraining . setModel ( new SpinnerNumberModel ( 10 , 2 , 100 , 1 ) ) ;